Below is a 1968 advertisement for units that were on sale at 47 Wharf Road in Birchgrove known as The Outrigger. Birchgrove has progressed significantly over the past five decades. As for the ten boat marina, there is a wharf, but I don't think ten boats (like those in the advertisement) would fit there. 10 Tinnies maybe???
Source: Vale & Co. Pty Ltd. 1968. "Untitled" (Advertisement). The Daily Telegraph, September 22: 32.